Mortuary + One with the Multiverse + Walking Ballista

UB identity

Commander legal

The 3 combo pieces

How to execute it

  1. Cast Walking Ballista either from your hand or from the top of your library by paying {0}.
  2. Walking Ballista enters the battlefield and dies as a state-based action due to having zero toughness.
  3. Mortuary triggers, putting Walking Ballista on top of your library from your graveyard.
  4. Repeat.

What the combo produces